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Modification of the Backbone Structure

This is in contrast to the situation with analogous ferrocene compounds, where the substitution of OH with nucleophiles under the same conditions proceeds [Pg.136]

Another possibility for creating a new ligand structure is to connect two phos-phaferrocene molecules via their formyl functional groups. The reductive coupling of carbonyl compounds with low-valent Ti reagents - the McMurry reaction - is a technique that has found wide application in organic synthesis [18]. [Pg.137]

The E and Z configurations were assigned by determining the Jhh coupling constant between the two chemically equivalent olefinic protons from the satellites in the H P NMR spectrum, and has been confirmed by X-ray analysis of both isomers [19], [Pg.137]

From a stereochemical point of view, the pinacol-type coupling is much more interesting, because two new stereogenic centers are established at the former carbonyl C atoms. When the coupling reactions described above were carried out with (R)-2 at 0 °C the pinacol product 19 (Fig. 1.5.4) was obtained as one out of three possible stereoisomers. [Pg.137]


See other pages where Modification of the Backbone Structure is mentioned: [Pg.136]    [Pg.137]    [Pg.385]   


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